There is absolutally no reason not to at least have a basic LFG tool, and at least put you in a server wide LFG channel. Right now its broken and worthless and impossible to find groups unless its people from your guild.
There is little reason not to have a que system similar to the PVP one, though it would be nice if both let you que for a specific warzone or flashpoint instead of a random one. Server wide or cross server, I don't care, and the people whining about it either have rose tinted glasses are idiots. I remember tanking and healing in classic WoW and burning Crusades. You know what? It sucked to try and get a heroic, or even a random dungeon group together. You sat in IF or Shat or whatever and spammed for hours, and even then you sometimes didn't get a group. And when you did, if you got baddies, it was over. You wipped on shattered halls trash or couldn't get past the first half of BRD and that was that. A LFG tool like WoWs is a great step forward, community be damned. You can still group with guildies.